Fast growth at low temperature in vacancy-mediated phase separation - art.no. 060102

We study the phase-separation dynamics of a two-dimensional Ising model whe re A and B particles can only exchange position with a vacancy. In a wide r ange of temperatures the kinetics is dominated, during a long preasymptotic regime, by diffusion processes of particles along domain interfaces. The d ynamical exponent z associated to this mechanism differs from the one usual ly expected for Kawasaki dynamics and is shown to assume different values d epending on temperature and relative AB concentration. At low temperatures, in particular, domains grow as t(1/2), for equal AB volume fractions.